v3.26.1
Post-employment Benefits - Fair value of plan assets (Details) - MXN ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Post-employment pension plans.    
Beginning of year $ (772,482) $ (733,049)
Retirement of spun-off businesses 23,403 (84,067)
Return on plan assets 36,881 35,596
Remeasurement on plan assets (88,707) (62,779)
Benefits paid 71,737 75,010
End of year (954,248) (772,482)
Pensions    
Post-employment pension plans.    
Beginning of year (172,493)  
Retirement of spun-off businesses 23,286  
Remeasurement on plan assets (27,412)  
Benefits paid 46,460  
End of year (212,665) (172,493)
Seniority Premiums    
Post-employment pension plans.    
Beginning of year (599,989)  
Retirement of spun-off businesses 117  
Remeasurement on plan assets (61,295)  
Benefits paid 25,277  
End of year (741,583) (599,989)
Plan assets    
Post-employment pension plans.    
Beginning of year 431,982 474,479
Retirement of spun-off businesses (23,403) (1,888)
Return on plan assets 36,881 35,596
Remeasurement on plan assets 1,480 7,310
Benefits paid (26,537) (83,515)
End of year 420,403 431,982
Plan assets | Pensions    
Post-employment pension plans.    
Beginning of year 389,703  
Retirement of spun-off businesses (23,286)  
Return on plan assets 33,045  
Remeasurement on plan assets 1,456  
Benefits paid (26,537)  
End of year 374,381 389,703
Plan assets | Seniority Premiums    
Post-employment pension plans.    
Beginning of year 42,279  
Retirement of spun-off businesses (117)  
Return on plan assets 3,836  
Remeasurement on plan assets 24  
End of year $ 46,022 $ 42,279